Buggy code:
@ Path ( "//acquiredataservice" ) public class AcquireDataService { private static final String TEXT_PLAIN = "text//plain" ; @ GET @ Path ( "//requestaddress//{username}//{password}" ) @ Produces ( "application//json" ) @ Mapped public AddressDTO requestaddress ( @ PathParam ( "username" ) String username , @ PathParam ( "password" ) String password ) throws ClassNotFoundException { AddressDTO dto = new AddressDTO ( ) ; Class . forName ( "org.sqlite.JDBC" ) ; Connection connection = null ; try { Context ctx = new InitialContext ( ) ; DataSource ds = ( ( DataSource ) ( ctx . lookup ( "java:comp//env//jdbc//AcquireMobileDevDB" ) ) ) ; connection = ds . getConnection ( ) ; Statement statement = connection . createStatement ( ) ; statement . setQueryTimeout ( 30 ) ; ResultSet rs ; int address_id = - 1 ; int collector_id = - 1 ; rs = statement . executeQuery ( ( ( ( ( "SELECT<seq2seq4repair_space>id<seq2seq4repair_space>FROM<seq2seq4repair_space>collector<seq2seq4repair_space>WHERE<seq2seq4repair_space>name<seq2seq4repair_space>=<seq2seq4repair_space>\"" + username ) + "\"<seq2seq4repair_space>AND<seq2seq4repair_space>password<seq2seq4repair_space>=<seq2seq4repair_space>\"" ) + password ) + "\"" ) ) ; if ( rs . next ( ) ) { collector_id = rs . getInt ( "id" ) ; } if ( collector_id == ( - 1 ) ) { return null ; } rs = statement . executeQuery ( ( "SELECT<seq2seq4repair_space>id<seq2seq4repair_space>FROM<seq2seq4repair_space>address<seq2seq4repair_space>WHERE<seq2seq4repair_space>status<seq2seq4repair_space>=<seq2seq4repair_space>'A'<seq2seq4repair_space>and<seq2seq4repair_space>collector_id<seq2seq4repair_space>=<seq2seq4repair_space>" + collector_id ) ) ; if ( rs . next ( ) ) { address_id = rs . getInt ( "id" ) ; } else { rs = statement . executeQuery ( "SELECT<seq2seq4repair_space>id<seq2seq4repair_space>FROM<seq2seq4repair_space>address<seq2seq4repair_space>WHERE<seq2seq4repair_space>status<seq2seq4repair_space>=<seq2seq4repair_space>'N'<seq2seq4repair_space>LIMIT<seq2seq4repair_space>1" ) ; if ( rs . next ( ) ) { address_id = rs . getInt ( "id" ) ; statement . executeUpdate ( ( ( ( "UPDATE<seq2seq4repair_space>address<seq2seq4repair_space>SET<seq2seq4repair_space>collector_id<seq2seq4repair_space>=<seq2seq4repair_space>" + collector_id ) + ",<seq2seq4repair_space>status<seq2seq4repair_space>=<seq2seq4repair_space>'A'<seq2seq4repair_space>WHERE<seq2seq4repair_space>id<seq2seq4repair_space>=<seq2seq4repair_space>" ) + address_id ) ) ; } } if ( address_id > ( - 1 ) ) { rs = statement . executeQuery ( ( "SELECT<seq2seq4repair_space>*<seq2seq4repair_space>FROM<seq2seq4repair_space>address<seq2seq4repair_space>WHERE<seq2seq4repair_space>id<seq2seq4repair_space>=<seq2seq4repair_space>" + address_id ) ) ; if ( rs . next ( ) ) { dto . setId ( rs . getInt ( "id" ) ) ; dto . setAddressText ( rs . getString ( "address_text" ) ) ; dto . setLatitude ( rs . getDouble ( "latitude" ) ) ; dto . setLongitude ( rs . getDouble ( "longtitude" ) ) ; dto . setStatus ( rs . getString ( "status" ) ) ; dto . setCollectorId ( rs . getInt ( "collector_id" ) ) ; } } <START_BUG> return null ; <END_BUG> } catch ( SQLException e ) { System . err . println ( e . getMessage ( ) ) ; } catch ( NamingException e ) { e . printStackTrace ( ) ; } finally { try { if ( connection != null ) connection . close ( ) ; } catch ( SQLException e ) { System . err . println ( e ) ; } } return null ; } @ POST @ Consumes ( "multipart//form-data" ) @ Path ( "//uploadresponse//{address_id}//{q1}//{q2}//{q3}" ) public void uploadresponse ( MultipartFormDataInput input , @ PathParam ( "address_id" ) String address_id , @ PathParam ( "q1" ) String q1 , @ PathParam ( "q2" ) String q2 , @ PathParam ( "q3" ) String q3 ) throws ClassNotFoundException { } @ POST @ Path ( "//uploadresponseperson//{address_id}//{name}//{age}//{work}" ) public void uploadresponseperson ( @ PathParam ( "address_id" ) String address_id , @ PathParam ( "name" ) String name , @ PathParam ( "age" ) String age , @ PathParam ( "work" ) String work ) throws ClassNotFoundException { } @ GET @ Path ( "//alldata" ) @ Produces ( "text//plain" ) public String alldata ( ) throws ClassNotFoundException { } @ GET @ Path ( "//responsephoto//{address_id}" ) public Response responsePhoto ( @ PathParam ( "address_id" ) String address_id ) { } }

Fix:
return dto ;